2 minute read
Lift cylinder ...................................................................5
How to assemble the conveyor power unit (Fig. 94)
1. Install the key in the electric motor shaft.
2. Apply Never Seez to the electric motor shaft and install the coupling hub onto the electric motor shaft. Roughly position the hub even with the end of the shaft. Do not tighten the set screw as final positioning of the hub will be determined at the end of assembly.
3. Install the element onto the coupling hub on the electric motor.
4. Apply Never Seez onto the open loop pump splined shaft. Install the remaining coupling hub onto the hydrostatic pump splined shaft (refer to Fig. 96 for dimensions).
5. Clean all mating surfaces on the connecting tube and the electric motor.
6. Apply Loctite 242 (blue) to the eight bolts and install bolts, flat washers, and lock washers into the connecting tube. Torque incrementally and evenly to 170 ft-lbs as follows:
■ Step 1: 50 ft-lbs ■ Step 2: 100 ft-lbs ■ Step 3: 170 ft-lbs
IMPORTANT! It is extremely important that the connecting tube pulls up evenly on the electric motor. If the connecting tube is cocked, misalignment between the pump and the electric motor will occur and the coupling will fail.
7. Install the open loop pump. Align the pilot hub on the pump with the pilot bore of the connecting tube while simultaneously engaging the jaws of the Rotex coupling halves.
8. Install four bolts, flat washers, and lock washers and torque incrementally and evenly to 280 ft-lbs as follows:
■ Step 1: 90 ft-lbs ■ Step 2: 200 ft-lbs ■ Step 3: 280 ft-lbs
Refer to Figure 96 to verify distance between the coupling jaws and the coupling element of 0.18”. This distance must be maintained to avoid element failure. Adjust the gap as required by repositioning the hub on the electric motor shaft as required.
9. Check coupling half alignment by using a straight edge across the two coupling halves (see Fig. 96). Rotate the electric motor and measure the spacing in at least two places to ensure the electric motor and pump shafts are aligned. If there is misalignment, the connecting tube may be cocked or the mating surfaces may not be clean. This misalignment must be corrected before proceeding with assembly. ______________________________________________________________
IMPORTANT! The coupling halves must be aligned before proceeding with assembly. If the coupling haves are not aligned, component failure may occur.
10. Apply Loctite 242 (blue) to the set screw on the coupling hub of the electric motor shaft and torque to 275 in-lbs.
11. Remove the end plate from the open loop pump in order to install the back gear pump by removing the four bolts.
12. Verify that the o-ring and splined pump insert are pre-installed by the pump manufacturer. If not, the o-ring and splined pump insert that were removed during disassembly can be reused or replaced with a new o-ring and splined insert (see your Bucyrus America,
Inc. parts manual that shipped with your machine).
13. Apply clean hydraulic fluid to the shaft of the piggy back gear pump and to the o-ring of the hydrostatic pump.
14. Install the gear pump being careful to properly align the splines and not cut the o-ring.
15. Install the four bolts, lock washers, and flat washers in the gear pump. Torque incrementally and evenly to 80 ft-lbs as follows:
■ Step 1: 20 ft-lbs ■ Step 2: 50 ft-lbs ■ Step 3: 80 ft-lbs
